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A small magnet A makes 10 vibrations in ...

A small magnet A makes 10 vibrations in 90 seconds in earth's field. When another magnet B of short length is placed 0.1 m due south of the direction of earth's field, the magnet A makes 10 vibrations in 45 seconds . Calculate the magnetic moment of magnet B. Given `B_(H)=0.3 G`

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The correct Answer is:
`0.45 Am^(2)`
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SL ARORA-MAGNETISM-Based on (i) Earth s Magnetism (ii) magnetic field of a bar magnet
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